Well you have August, May, June, April which are names people use. I think there's a celebrity with a kid called DecemberRose (Which I quite like actually). Personally I'm not keen on them being named after months as such. - My boyfriends nan's middle name is May but not because of the month. - I new a girl called Tuesday.

I think CormacMarch .... - Might be quite cute but not March being the first name.

I kind of like it but I don't think of March the month but the verb.
(Granted when I hear August I think of the word as well. As in "august and famous studio").
So when I hear March I think Military march. Or "march up to your room" or something like that. Neither of which I find compelling enough to name a child.